Michael Ellis OSB (8 September 1652 – 16 November 1726)[1] was an English Benedictine monk who was a prelate of the Catholic Church.
Of six brothers, John, the eldest, became Under-Secretary of State to William III of England; William, a Jacobite Protestant, was Secretary of State of James II of England in exile; Welbore became Protestant bishop of Kildare and afterwards of Bishop of Meath, Ireland; Samuel was Marshal of King's Bench; and Charles an Anglican clergyman.
In 1688 he was appointed vicar Apostolic of the newly created Western District and was consecrated by Ferdinando d'Adda, the papal nuncio (6 May).
During the Glorious Revolution of 1688 Ellis was imprisoned, but being soon liberated he retired to the Château de Saint-Germain-en-Laye in France and afterwards to Rome.
In 1696 he was named an Assistant at the Pontifical Throne; in Rome his knowledge of English affairs made him so useful that his repeated petitions for leave to return to his vicariate were refused.